Toolbox Talk: Carbon Monoxide - The Silent Killer

Carbon Monoxide (CO) is a by-product of the combustion process. Inhalation of CO decreases the blood’s ability to carry oxygen to parts of the body. CO attaches to the red blood cells more readily than oxygen. The attraction for CO is about 240 times stronger than for oxygen. Even low levels of CO can be deadly. CO poisoning commonly occurs from using temporary heating devices that are not vented correctly and from vehicle exhaust. If you suspect CO may be present, get out of the area immediately.

Points to Remember:
1. Carbon monoxide (CO) is colorless, odorless, and very deadly.

2. Inhalation of carbon monoxide decreases the ability of blood to carry oxygen to body parts.

3. Effects can be accumulated over several hours in low-concentration areas, however, very high concentrations of CO can be quickly fatal without any warning symptoms.

4. Maximum exposure of CO is 50 ppm.

5. Some signs of CO poisoning are drowsiness, headaches, nausea, dizziness, and rapid breathing. Others may notice a cyanotic or “bluish” cast to the skin color due to a lack of oxygen in the tissue.

6. Never use an unvented gas oven or stove for space heating, or use propane-fired heaters in an enclosed area. If they are in a tightly enclosed area, there is no way for the fumes to escape.

7. If you sit in a vehicle idling for long periods to stay warm, be sure to keep a window partially open to allow fresh air to enter the vehicle.

8. All heating appliances should be checked before cold weather sets in.

9. Check all temporary heating devices to make sure that the burners are properly adjusted, and vent pipes are unobstructed and in good working condition.